Check the package build - you may find that the udeb is actually what
you need.

Looks like the udeb is really too restricted -- contains almost only the "/sbin/mdadm" binary...

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Or, you can gain a little bit of space and convert any package from

Debian into an Emdebian Grip package using 'apt-grip' which is in the
emdebian-grip package. Install that on a desktop system, specify the
architecture to download and convert, then put the converted package
into a local repository and add that to your multistrap config.

Indeed, I can use the Debian package, which can also be run through apt-grip.

But what about updates of the package that may be released in the future?

Does that mean that I have to set up my own local repository if I want to "do things right"?